YATE is a telephony engine aimed at creating a telephony server that performs well enough to deal with PBX requirements and also flexible enough for complex Gateway and IVR solutions.

Features:
VoIP server
SS7 switch
VoIP client
Jabber server
Jabber client
Conference server - with up to 200 voice channels in a single conference
VoIP to PSTN gateway
PC2Phone and Phone2PC gateway
IP Telephony server and/or client
H.323 gatekeeper
H.323 multiple endpoint server
H.323<->SIP Proxy
SIP session border controller
SIP router
SIP registration server
IAX server and/or client
Jingle client or server
MGCP server (Call Agent)
ISDN passive and active recorder
ISDN, RBS, analog passive recorder
Call center server
IVR engine
Prepaid and/or postpaid cards system
This package contains YATE Server itself.